Pressure distribution and total pressure loss were measured by fixed transducers on proper positions of dual rotating cavities. The results show that with turbulent flow parameter varying from 0.1 to 0.4

the pressure on rotating disk decrease with the increasing rotational Reynolds number at first

and then increases with the increasing rotational Reynolds number. The critical turbulent flow parameters for these two cavities are different. Under the same turbulent flow parameter

rotational Reynolds number dominates the shape of pressure distribution curves on the rotating disk surfaces. When turbulent flow parameter increases

total pressure losses of two cavities become larger. But when rotational Reynolds number increases under the same turbulent flow parameter

total pressure losses of these two cavities are different.